clerictgm Posted December 19, 2012 Report Share Posted December 19, 2012 (edited) Don't know how to name a topic. I want to ask if i right or not in comparison, because gear ratio isn't so accurate I've tried to calculate difference between 26 stock transmission and my bike transmission. Trial stock: 26" 175mm cranks 18-15 gear ratio My bike: 24" 170mm cranks 18-12 gear ratio 18 / 15 = 1.2 18 / 12 = 1.5 175 / 170 = 1.02941176 26 / 24 = 1.08333333 1.5/1.2*1,029412/1,083333= 1,18778344 (1,18778344-1)*100=18,778344 So, it seems that transmisson of my bike is 18,78% tighter than 26 stock. Am I right? Edited December 19, 2012 by clerictgm Quote Link to comment Share on other sites More sharing options...
N.Wood Posted December 19, 2012 Report Share Posted December 19, 2012 Wut 2 Quote Link to comment Share on other sites More sharing options...
clerictgm Posted December 19, 2012 Author Report Share Posted December 19, 2012 I want to say that cranks length and wheel diameter affects on effort transmission. Not only gear ratio! Quote Link to comment Share on other sites More sharing options...
dezmtber Posted December 19, 2012 Report Share Posted December 19, 2012 Go to Google and search. Sheldon brown gear calculator. On the he has gain ratios which does calculate including wheel size and crank length, even Tyre size happy dayz hope this fixes your gearbox Quote Link to comment Share on other sites More sharing options...
Revolver Posted December 19, 2012 Report Share Posted December 19, 2012 So, it seems that transmisson of my bike is 18,78% tighter than 26 stock. Am I right? It doesn't really matter. You know that whole 'oh, this gear is too hard for me' and 'oh, this gear is too soft for me' thing? Use that to work out what you want. 1 Quote Link to comment Share on other sites More sharing options...
dann2707 Posted December 20, 2012 Report Share Posted December 20, 2012 Unless you're lonely, if so carry on as the above. Quote Link to comment Share on other sites More sharing options...
MadManMike Posted December 20, 2012 Report Share Posted December 20, 2012 First thing that sprung to mind was "Wut". Then I see the first reply was exactly that. Does anyone else calculate their gear ratios this precisely? Quote Link to comment Share on other sites More sharing options...
Jake. Posted December 20, 2012 Report Share Posted December 20, 2012 <blockquote class='ipsBlockquote'data-author="MadManMike" data-cid="2473404" data-time="1355973658"><p> First thing that sprung to mind was "Wut". Then I see the first reply was exactly that.<br /> <br /> Does anyone else calculate their gear ratios this precisely?</p></blockquote> No. I hate it when people over analyse this kind of shit, just ride. I remember Laurences carthy bar angle topic, he sketched up a diagram thing to try get the carthy angle reach without the bars being at a silly angle... Quote Link to comment Share on other sites More sharing options...
clerictgm Posted December 20, 2012 Author Report Share Posted December 20, 2012 > I hate it when people over analyse this kind of shit, just ride. I feel that I need to change rear sprocket fnd calculate this to be 100% sure. Because changing sprocket may be pain in the ass. Quote Link to comment Share on other sites More sharing options...
dngr2self Posted December 20, 2012 Report Share Posted December 20, 2012 <blockquote class='ipsBlockquote'data-author="clerictgm" data-cid="2473408" data-time="1355979559"><p> I feel that I need to change rear sprocket fnd calculate this to be 100% sure. Because changing sprocket may be pain in the ass. </p></blockquote> Get some proper instruments and it should be pretty easy. Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted December 20, 2012 Report Share Posted December 20, 2012 (edited) First thing that sprung to mind was "Wut". Then I see the first reply was exactly that. Does anyone else calculate their gear ratios this precisely? it was the wrong comparison btw. gear display: 18-15-26":2.58m 18-12-24":2.94m 18-14-24":2.52m 14t is the nearest you compared wheels with different masses and leverages,gear display shows the raw wheel movement factor in meters. clean from % or ratio it would be feeling the same at your 24 if you´d use a 14t with the 170 cranks Edited December 20, 2012 by FamilyBiker Quote Link to comment Share on other sites More sharing options...
clerictgm Posted December 20, 2012 Author Report Share Posted December 20, 2012 Proper whaaaaat? I need some biiiiiiiig vise. That vise need to be setted up on biiig table. I don't have a big table, and big vise costs alot. So it would be difficult. Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted December 20, 2012 Report Share Posted December 20, 2012 no hammer,no screwdriver,no knife,just a chainwhip and a long lever Quote Link to comment Share on other sites More sharing options...
isitafox Posted December 20, 2012 Report Share Posted December 20, 2012 What I don't understand is the fact you already made a topic asking what gear ratio to run and were told 18/14 for trialsy or 18/13 for a bit more speed and you didn't listen. Now you're asking the exact same question again? Quote Link to comment Share on other sites More sharing options...
bing Posted December 20, 2012 Report Share Posted December 20, 2012 What I don't understand is the fact you already made a topic asking what gear ratio to run and were told 18/14 for trialsy or 18/13 for a bit more speed and you didn't listen. Now you're asking the exact same question again? Use the power you have dave Quote Link to comment Share on other sites More sharing options...
clerictgm Posted December 20, 2012 Author Report Share Posted December 20, 2012 What I don't understand is the fact you already made a topic asking what gear ratio to run and were told 18/14 for trialsy or 18/13 for a bit more speed and you didn't listen. Now you're asking the exact same question again? It's not the same question. Cranks/wheel size affects alot. Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted December 20, 2012 Report Share Posted December 20, 2012 gear ratio/power and bar/stem setup play a role as effective toptube/reach does,too :wink2: Quote Link to comment Share on other sites More sharing options...
SamKidney Posted December 20, 2012 Report Share Posted December 20, 2012 I just use whats common. 26" - 18-15 24" - 18-14 20" - 18-12 Dont loose sleep because you cant figure out to what percentage your ratio may be harder/easier will you. And PLEASE stop posting rubbish! Quote Link to comment Share on other sites More sharing options...
clerictgm Posted December 20, 2012 Author Report Share Posted December 20, 2012 (edited) Well, because of tips I've heared here about bars/stackers is really-really useful I want to know as much as I can before changing something. Of course not without testing it by myself. Mark said that higher gear ratio is ok for pedal kicks, just it's necessary some time to get used to it and some change in technique. And now with 18-12 It's really scaring hard to do pedal kicks. So I don't know will I get used to it or I will have to change my gear ratio. Also there are no 13T sprockets in all trials shops (only 3) in Russia. Edited December 20, 2012 by clerictgm Quote Link to comment Share on other sites More sharing options...
JD™ Posted December 20, 2012 Report Share Posted December 20, 2012 You've been told. 18:13* is the way for street, 18:14 for more trialsy stuff. Go change your sprocket, and quit bitching. *22:15 if you're awesome. Quote Link to comment Share on other sites More sharing options...
isitafox Posted December 20, 2012 Report Share Posted December 20, 2012 *22:15 if you're awesome. Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted December 20, 2012 Report Share Posted December 20, 2012 Also there are no 13T sprockets in all trials shops (only 3) in Russia. It doesn't need to be a trials shop. Track bikes (think velodrome) and gay fixies (if you have such things in Russia) would be another source for the parts. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted December 20, 2012 Report Share Posted December 20, 2012 It's a sign to run 18:14 Quote Link to comment Share on other sites More sharing options...
clerictgm Posted December 20, 2012 Author Report Share Posted December 20, 2012 (edited) You've been told. 18:13* is the way for street, 18:14 for more trialsy stuff. Go change your sprocket, and quit bitching. *22:15 if you're awesome. Are you blind or whaaaat? I can't find f*ing 13T sprocket in whole Russia! And changing drivetrain to 22:15 would be stupid. Edited December 20, 2012 by clerictgm Quote Link to comment Share on other sites More sharing options...
JD™ Posted December 20, 2012 Report Share Posted December 20, 2012 Y'know that stuff that comes through your letterbox every now and again, probably daily? The same people who deliver you that can deliver you a 13t sprocket from a vendor of your choice. By "vendor of your choice", I mean Tartybikes. Stop being a little girl, and trying to be mathy about something you don't need to be mathy about, and get it done. 1 Quote Link to comment Share on other sites More sharing options...
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